Foot and leg exercising device providing passive motion benefits

ABSTRACT

An exercise and physical therapy device using inertia and momentum to provide both resistance training and passive assisted movement for a user&#39;s foot or feet. A foot pedal is mounted for pivoting movement in a frame. The pivoting movement of the foot pedal is translated into rotational movement of a flywheel. As a user begins pivoting motion of the foot pedal, the flywheel provide resistance to this movement. The user may continue to use the foot pedal for resistance training. Once the flywheel is in motion a user may rest a foot or feet on the foot pedal and the rotational movement of the flywheel caused by the flywheel&#39;s momentum will cause pivoting motion of the foot frame. This presents passive assisted movement to a user&#39;s foot and legs until the momentum of the flywheel is dissipated.

RELATED APPLICATIONS

This application claims benefit of a provisional application, Ser. No. 60/792,202, with a filing date of Apr. 14, 2006.

FIELD OF THE INVENTION

This invention is a foot and leg exercising device which provides medical benefits including exercise, increased circulation, range of motion benefits, and reduced foot and leg pain.

BACKGROUND OF THE INVENTION

The heart pumps blood throughout the extremities to provide essential oxygen and nutrients to the tissue in the extremities. The deoxygenated and waste product laden blood is then returned to the heart and internal organs for cleansing and oxygenation, and then is repumped to the body.

The return flow occurs, in part, due to the pressure generated in the veins, the pull of the right auricle of the heart, and through the milking effect of the muscle contractions in the extremities, particularly the “calf pump” mechanism of the lower extremities.

Muscle contractions that occur during activities of daily living facilitates this return flow of blood, but prolonged sitting or standing causes deoxygenated blood to stagnate. This leads to general fatigue and tired, heavy legs, and edema. Over a period of time, repetition of this cycle can lead to more serious conditions such as varicose veins, Restless Leg Syndrome, neuropathies, deep vein thrombosis, and leg ulcerations, to name a few.

In order to facilitate return blood flow a number of expedients have been employed. For those who are bedridden, intermittent external compression is used, primarily designed to prevent deep vein thrombosis. External compressive hose are often worn by those with leg circulatory issues.

Other devices have been proposed for physical therapy or exercise that utilize a foot pedal or treadle type arrangement, which allows a person a controlled exercise regimen using their feet and ankles to manipulate against a resistance foot pedal. For example in Kane et al., U.S. Pat. No. 4,501,421, a foot treadle device operates to provide a resistance force to the pivoting of foot plates. Shimizu, U.S. Pat. No. 3,741,540, discloses foot boards mounted for pivoting with springs providing resistance. A similar device is seen in Kuo, U.S. Pat. No. 6,705,975. It is has also been recognized that even passive motion, where no muscle activity from the user is required, may provide benefits. Matthew, U.S. Pat. No. 6,758,825, provides a foot pedal, with straps to secure the user's foot on the device, which is attached to a reciprocating motor. The motor rotates forcing a reciprocating rod in a circular motion, which is translated into an approximate linear motion for the foot pedal. This causes a back-and-forth motion for the foot. While the Matthew device is anticipated to have use in a variety of contexts, it is primarily designed for people who may have severe physical impairments, such as those confined to a wheelchair. The motor assisted motion prevents deterioration in muscles, which would otherwise be flaccid or unexercised because of some physical or nerve condition that prevents the patient from exercising those muscles themselves. The Matthew device facilitates blood flow in the veins and, therefore, may prevent deep venous thrombosis. Despite this earlier work, there is still an unmet need for a physical exercise device which is simple to construct, inexpensive to produce, can be widely distributed, be used in a wide variety of clinical, home, and office settings to produce high repetitions, without muscle fatigue, to purge the circulatory system of the legs.

SUMMARY OF THE INVENTION

The current invention utilizes a pivoting pedal. Ordinarily, this pedal would be large enough for a user to use one or two feet on the pedal at the option of a user. The pedal pivots back and forth. A user's foot on the pedal also pivots around the ankle joint. The foot pedal is attached at the end to a rod. This rod is mounted on the foot pedal for pivoting movement. At the end of the rod, opposite from its pivoting mount on the foot pedal, there is a connection to a rotating crank. Thus, as the foot pedal pivots about its mounting in the approximate midpoint as the rod moves, it rotates the crank shaft. The crank shaft is connected to a circular flywheel. This flywheel provides resistance. A user must work the foot pedal to overcome the inertia of the flywheel. The operative parts of the device are enclosed in a frame in order to stabilize the device and to provide a secure stationary mount for the rotating flywheel. The flywheel is enclosed in a protective frame or screen in order to prevent contact with the flywheel from the outside.

In use, a user will place one or both feet on the pivoting foot pedal, with the approximate pivot point of the ankle at or near a pivoting connection for the foot pedal. The user then may use either the toe or heel portion of the foot to press on the foot pedal. This starts a motion of the foot pedal which causes an arc-like vertical motion of the reciprocating rod. The reciprocating rod causes a circular motion for the rotating fly wheel. Because the flywheel will have significant mass, the inertial resistance of the flywheel must be overcome by the user. The user can then increase the rate of the rotation of the flywheel by increasing the rate of the manipulation of the foot pedal by the user's foot. This resultant movement, assisted by inertia, provides a unique form of exercise, a cross between active and active/assistive exercise. As a result, the user can perform hundreds or thousands of repetitions, engaging the calf pump mechanism and muscle contractions to facilitate return blood flow. This inertia assisted movement allows this apparatus to be used daily, or even multiple times daily, day after day, without the usual fatigue lactic acid buildup within the muscles.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view from above of the foot and leg exercising device.

FIG. 2 is a side view seen in partial cut-a-way of the foot and leg exercising device.

FIG. 3 is a view from above of the leg exercising device with the user's feet placed on the device

DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1 is a prospective view of the foot and leg exercising device (10). The foot pedal (30) is mounted for reciprocating motion on pedal mounts (32). The pedal mounts (32) are mounted on the frame (20). A push rod (40) is mounted to the foot pedal (30) by a spherical bushing (42). It is also connected to a rotating crank (50) at the end opposite of the pivot mount (42) by a trunion (45). The crank (50) is connected to the flywheel (60), which is seen inside of the flywheel cover (65). The flywheel cover (65) is attached to the foot pedal frame (20).

FIG. 2 shows the foot and leg exercising device (10) in a partial cut-a-way side view, which better shows the operation of the crank (50), reciprocating rod (40), trunion (45), and yoke (48). The basic purpose of the crank (50), push rod (40), spherical bushing (42), trunion (45), and yoke (48) is to provide a connection between the foot pedal (30) and the flywheel (60). The foot pedal (30) pivots about the pedal mounts (32) in a short arc of motion. The arc of motion is short enough so that the motion of the foot pedal (30) at the point where the push rod (40) is mounted by the pivot mount (42) to the foot pedal (30) is approximately linear. Consequently, it is necessary to translate the approximate linear motion of the foot pedal (30) into a circular motion to drive the flywheel (60). There are a variety of expedients to translate the motion of the foot pedal (30) into the circular motion of the flywheel (60) and to also communicate the inertial force of the rotating flywheel (60) back to the foot pedal (30) to produce pivoting motion of the foot pedal (30) around the foot pedal mounts (32). As long as the method chosen is relatively safe, tends to reduce or minimize friction, and can be constructed at a reasonable cost, the exact mechanical connection between the foot pedal (30) and the flywheel (60) is a matter of choice among those of reasonable skill in the art. Here, the push rod (40) has a spherical end which fits into a spherical bushing (42) mounted to the foot pedal (30). This allows the push rod (40) a limited pivoting range of motion on the foot pedal (30) which is necessary as it drives the trunion (45) mounted on the yoke (48). The crank (50) is mounted to the trunion (45) with bearings within the trunion (45). The bearings are not seen in the drawings, but this allows the crank (50) to rotate within the trunion (45) as the trunion (45) is mounted on the yoke (48) for reciprocating motion on the push rod (40). Thus, as the push rod (40) moves up and down, it forces a circular motion of the crank (50). The motion could be either clockwise or counterclockwise, but, in any event, the circular motion produced by the crank (50) is communicated to the flywheel (60).

FIG. 3 shows a user's feet (100) resting on the foot pedal (30). Here, the reciprocating rod (40) and the crank (50) are in the approximate six o'clock position, so a user would begin to operate the device by pressing down with the user's heel. This would force the heel portion of the foot pedal (30) downward. The foot pedal (30) pivots on the foot pedal mount (32) forcing the reciprocating rod (40) in an upward direction. Because the reciprocating rod (40) and the crank (50) are connected, either a clockwise or counterclockwise motion of the crank (50) results. As the reciprocating rod (40) and the crank (50) reach the approximate twelve o'clock position, the user may then press down with the toes. By alternately pressing down with the toe or the heel portion of the user's foot, a continuous circular motion is imparted to the flywheel (60). Initially, the resistance provided by the flywheel (60) would be the greatest because of friction and inertia. Once the flywheel (60) has reached a satisfactory rate of rotation, a user may then stop applying force with the heel or toe and simply rest one's feet (100) on the foot pedal (30). However, the foot pedal (30) motion will not stop immediately because the flywheel (60) has a significant mass and will continue to rotate because of inertial forces. In order to keep the flywheel (60) rotating, relatively little effort is required from a user. Here, the momentum of the flywheel (60) is assisting a user rather than resisting the user. Thus, this invention allows momentum assisted repetitions. Because the number of repetitions is assisted by the momentum of the flywheel (60), the user may perform, high numbers of repetitions without muscle fatigue. The continuous motion provided by the inertial force of the flywheel results in a purge of the circulatory system in the area of the muscles being used. Because no continuous effort is required from the user, the user may rest between the period of time the user is required to impart momentum to a flywheel (60). This enables the user to perform a longer exercise program than would be the case without the momentum assisted repetitions. This is of benefit in special circumstances where a user may be impaired, have weak muscles, be morbidly obese, or in other ways that require assistance from the exercise device. However, the user can use the device to provide continuous resistance training by overcoming the resistance to the motion imparted by the inertial motion of the flywheel (60) as it circulates. If the user presses the toe downward when the flywheel (60) wishes to force the foot pedal (30) toe portion upward or using the heel to press downwardly on the heel portion of the foot pedal (30) when that overcomes the upward motion imparted by the flywheel (60).

Whether with or without resistance, this motion is beneficial to a user. First, it provides a range of motion for the foot and ankle, increasing flexibility. Second, it causes motion in the muscles of the ankle, foot, and leg, which promotes appropriate circulation and provide some benefit for increased strength even without resistance training. In this fashion, this device can be used as a physical therapy device for people with limited physical ability. It can also be used by normal people for resistance exercise. It can be used by people who are seated and wish to provide continuous circulatory assistance without constant or regular resistance or muscle effort. It has benefits for people who have Restless Leg Syndrome. It has shown to be of benefit to people who have peripheral diabetic neuropathy. It can also be used to warm up or cool down from more vigorous exercise. The device requires no plug or electrical outlets to operate. It is easily portable, can be placed under a desk or in an office. The flexibility, ease of use, and lack of effort required from a user has substantial benefits in promoting circulatory health in the extremities of the user and in purging the blood system in the area of use for a user. 

1. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot comprising: (a) a frame; (b) mounted for pivoting movement on said frame, at least one foot pedal; (c) means for connecting said at least one foot pedal to an inertia and momentum storage device whereby a user actively manipulates said at least one foot pedal with at least one foot overcoming the inertial provided by said at least one inertia and momentum storage device and where a user passively allow momentum of said at least one inertia and momentum storage device to assist motion of said at least one foot pedal providing passive motion to a user's foot without requiring work from a user;
 2. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 1 wherein said at least one inertia and momentum storage device comprises at least one flywheel mounted for rotational movement on said frame.
 3. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 2 wherein said at least one flywheel is mounted inside a safety screen whereby circular motion of said at least one flywheel is contained within said safety screen to prevent injury from rapid rotational movement of said at least one flywheel.
 4. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 3 wherein said means for connecting said at least one foot pedal to said at least one flywheel further comprises said means for translating said pivoting motion of said at least one foot pedal into circular motion to initially drive said flywheel.
 5. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 4 wherein said means for connecting said at least one foot pedal to said at least one flywheel further comprises means for translating that at least one fly wheel's circular motion into pivoting motion of said at least one foot pedal whereby at least one flywheel will provide pivoting motion to said at least one foot pedal to provide passive motion to user's foot without requiring work from a user.
 6. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 5 wherein said at least one foot pedal is sized for receipt of both feet of a user.
 7. A physical therapy and exercise device using inertia to provide for resistance and momentum to provide assistance to a user's foot of claim 6 wherein at least one flywheel is connected to said frame proximal to a first toe end of said at least one foot pedal whereby a user's feet will rest on said frame, a user's toe is positioned at a first toe end of said at least one foot pedal and a user's heels at a second heel end of said foot pedal and said flywheel is proximal to said toe end of said foot pedal and distal to said heel end of said foot pedal.
 8. A method to provide physical therapy and exercise to a user using inertia to provide resistance and momentum to provide assistance comprising: (a) providing a frame; (b) mounting for pivoting movement on said frame at least one foot pedal; (c) providing an inertia and momentum storage device attached to said frame; (d) connecting said foot pedal to said inertia and momentum storage device whereby a user may actively use at least one foot to manipulate said foot pedal against the inertia provided by said inertia and momentum storage device for active exercise and a user may passively rest at least one foot pedal for passive movement of said foot pedal provided by momentum in said inertia and momentum storage device.
 9. A method to provide physical therapy and exercise to a user using inertia to provide resistance and momentum to provide assistance of claim 8 wherein said step of providing an inertia and momentum storage device further comprises providing at least one fly wheel mounted for rotational movement on said frame.
 10. A method to provide physical therapy and exercise to a user using inertia to provide resistance and momentum to provide assistance of claim 9 wherein said method further comprises providing a safety screen to contain said flywheel to prevent injury from rapid rotational movement of said flywheel.
 11. A method to provide physical therapy and exercise to a user using inertia to provide resistance and momentum to provide assistance of claim 10 wherein said connecting said foot pedal to said inertia and momentum storage device further comprises providing a means for connecting that said connecting of said flywheel will provide pivoting motion to said at least one foot pedal to provide passive motion to a user's foot without requiring work from a user by using momentum stored in said inertia and momentum storage device.
 12. A physical therapy and exercise device using inertia to provide resistance and momentum to provide assistance to a user comprising: A. A generally arc-shaped frame, said frame spaced to mount a foot pedal with mounting points on said frame; B. A foot pedal sized to fit within said space in said frame and to mount on the said mounting points on said frame for pivoting movement; C. A flywheel rotatably mounted on said frame; D. Means for mechanically connecting said foot pedal to said flywheel, said mechanical connection means comprising at least one reciprocating rod and at least one crank connected to said reciprocating rod.
 13. A physical therapy and exercise device of claim 12 using inertia to provide resistance and momentum to provide assistance to a user wherein said frame further comprises a safety screen for said flywheel.
 14. A physical therapy and exercise device of claim 13 using inertia to provide resistance and momentum to provide assistance to a user wherein said flywheel is mounted on said foot pedal proximal to a first toe end of said foot pedal whereby a user's feet will rest on said frame and a user's toe is positioned at a first toe end of said foot pedal and said flywheel is proximal to said toe end of said foot pedal and distal to a heel end of said foot pedal. 